Hair trimmer



FIG. 1 is a top plan view of our new design of a hair trimmer;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a front end elevational view thereof;

FIG. 4 is a rear end elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a bottom plan view thereof.

The ornamental design for a hair trimmer, shown and described.